Stereo encoding method, stereo encoding device, and encoder

摘要

A stereo encoding method, a stereo encoding device, and an encoder are provided. The stereo encoding method includes: obtaining a left channel energy relation coefficient and a right channel energy relation coefficient; obtaining a left energy sum and a right energy sum respectively; performing cross correlation between sub-bands of a first monophonic signal at a wave trough and sub-bands of the left channel signal according to the left channel energy relation coefficient, and performing cross correlation between sub-bands of the first monophonic signal at the wave trough and sub-bands of the right channel signal according to the right channel energy relation coefficient; obtaining a scaling factor by using the left energy sum, the right energy sum, and cross correlation results; and encoding the stereo left and right channel signals according to the scaling factor.

主权项

1. A stereo encoding method, comprising:
obtaining a left channel energy relation coefficient between a first monophonic signal and a left channel signal and a right channel energy relation coefficient between the first monophonic signal and a right channel signal, wherein the first monophonic signal is generated by downmixing stereo left and right channel signals; obtaining a left energy sum of sub-bands of the first monophonic signal at a wave trough that are corresponding to the left channel energy relation coefficient and a right energy sum of the sub-bands of the first monophonic signal at the wave trough that are corresponding to the right channel energy relation coefficient respectively; performing cross correlation between the sub-bands of the first monophonic signal at the wave trough and sub-bands of the left channel signal according to the left channel energy relation coefficient, and performing cross correlation between the sub-bands of the first monophonic signal at the wave trough and sub-bands of the right channel signal according to the right channel energy relation coefficient, so as to obtain cross correlation results; obtaining a scaling factor by using the left energy sum, the right energy sum, and the cross correlation results; and encoding the stereo left and right channel signals according to the scaling factor.